CVE-2026-42784
HIGHCVSS 7.4Description
A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity.
Timeline
Published:September 16th, 2026 5:17 PM
Last modified:November 10th, 2026 2:17 PM
CVSS Scoring
CVSS v3: 7.4 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://access.redhat.com/errata/RHSA-2026:34160
- https://access.redhat.com/errata/RHSA-2026:42078
- https://access.redhat.com/errata/RHSA-2026:42902
- https://access.redhat.com/errata/RHSA-2026:76733
- https://access.redhat.com/errata/RHSA-2026:76734
- https://access.redhat.com/errata/RHSA-2026:76735
- https://access.redhat.com/errata/RHSA-2026:76737
- https://access.redhat.com/errata/RHSA-2026:79357
- https://access.redhat.com/errata/RHSA-2026:94791
- https://access.redhat.com/security/cve/CVE-2026-42784
- https://bugzilla.redhat.com/show_bug.cgi?id=2464122
Source: NIST NVD · Data may lag official sources by up to one minute